Wrack mostly consists of the kelp that washes onto beaches from the ocean. Wrack is an essential part of the ecology of the shoreline, providing food and habitat for everything from insects to birds.
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Mean density of two important members of the upper beach macrofaunal community — California beach hopper (Megalorchestia californiana) (red) and (Alloniscus perconvexus) (blue ) — from surveys of eight beaches on Santa Rosa Island from 1994 to 2015. Curved lines represent statistically smoothed means. For more information, consult Figure App.F.13.8 in the CINMS 2016 Condition Report.